Light source device, backlight device, and liquid crystal display

Abstract

A light source device 11 includes a plurality of tube-shaped light sources 17 arranged with an interval provided therebetween, so that an axis line L extends in the same direction; and a reflection plate 18 disposed on the backside of each light source 17 viewed from a light extracting direction. The reflection plate 18 includes a flat portion 28 opposed to the light source 17 and a concave shaped portion 27 recessed from the flat portion 28 in a direction spaced from the light source 17 , with an opening edge 29 formed in a circular shape or an oval shape. A plurality of concave shaped portions 27 are arranged along at least the axis line L of the light source viewed from the light extracting direction. Light distribution characteristics not dependent on an arrangement direction of the light sources 17 can be obtained.

1 . A light source device, comprising:
 a plurality of tube-shaped light sources arranged at intervals so that axis lines thereof extend along the same direction; and   a reflection member arranged to backsides of the light sources viewed from a light extracting direction and having a flat portion opposed to the light sources and a plurality of concave shaped portions recessed from the flat portion in a direction away from the light sources, the concave shaped portions having circular or elliptical opening edges formed at connection portions with the flat portion and being arranged at least along each of the axis lines of the light sources viewed from the light extracting direction.   
     
     
         2 . The light source device according to  claim 1 , wherein a radius of the circular shape or a long axis of the elliptical shape constituting the opening edge is larger than an outer radius of the light source. 
     
     
         3 . The light source device according to  claim 2 , wherein each of the concave shaped portions has a conical or parabolic surface. 
     
     
         4 . The light source device according to  claim 3 , wherein the axis line of each of the light sources and a center line formed by connecting positions spaced furthest from the axis line of the plurality of concave shaped portions arranged along the axis line substantially coincide with each other viewed from the light extracting direction. 
     
     
         5 . The light source device according to  claim 1 , wherein the concave shaped portions are arranged at the flat portion between the light sources adjacent to each other viewed from the light extracting direction. 
     
     
         6 . The light source device according to  claim 5 , wherein a depth of each of the concave shaped portions arranged between the light sources is deeper than the depth of each of the concave shaped portions arranged along the axis lines of the light sources. 
     
     
         7 . The light source device according to  claim 1 , wherein the light sources are arranged in a posture where the axis line extends in a gravity direction. 
     
     
         8 . The light source device according to  claim 7 , wherein the opening edges of the concave shaped portions arranged along the axis lines of the light sources have the optical shape with a short axis extending along the axis line viewed from the light extracting direction. 
     
     
         9 . A backlight device, comprising:
 the light source device according to  claim 1 ; and   an optical member including at least a diffusion plate having a light incident surface and a light outgoing surface and guiding lights emitted from the light source device from the light incident surface to the light outgoing surface so as to emit the lights from the light outgoing surface.   
     
     
         10 . A liquid crystal display, comprising:
 the backlight device according to  claim 9 ; and   a liquid crystal panel disposed so as to be opposed to the light outgoing surface of the diffusion plate.